1.

If two masses `m_(1)` and `m_(2)` collide, the ratio of change in their respective velocities is proportional toA. `(m_(1))/(m_(2))`B. `sqrt((m_(1))/(m_(2)))`C. `(m_(2))/(m_(1))`D. `sqrt((m_(2))/(m_(1)))`

Answer» Correct Answer - C
Let `u_(1), u_(2)` be velocities of `m_(1), m_(2)`, before collision, and `upsilon_(1), upsilon_(2)` be their respective velocities after collision. In every collision,
final momentum `=` initial momentum
`m_(1)upsilon_(1)+m_(2)upsilon_(2)= m_(1)u_(1)+m_(2)u_(2)`
`:. m_(1)(upsilon_(1)-u_(1))=m_(2)(u_(2)-upsilon_(2))`
or `(upsilon_(1)-u_(1))/(u_(2)-upsilon_(2))=(m_(2))/(m_(1))`


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